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5 Sheets-Sheet 1.

(No Model.)

J. SHARPE. COMBINED CASH INDICATOR, REGISTER, AND CALCULATOR.

Patented June 3,1890.

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(No'ModeL) Patented June 3, 1890.

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J. SHARPE. COMBINED CASH INDICATOR; REGISTER, AND CALCULATOR. No.429,486. Patented June 3, 1890.

(No Model.) 5 Sheets-Sheet 4.

J. SHARPE. COMBINED CASH INDICATOR, REGISTER, AND CALCULATOR.

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(No Model.) 5 Sheets$heet 5.

J. SHARPE. COMBINED CASH INDICATOR, REGISTER, AND CALCULATOR. No.429,486. a Patented June 3. 1890.

UNITED STATES PATENT OFFICE.

JOHN SHARPE, OF TORONTO, ONTARIO, CANADA, ASSIGNOR OF ONE-HALF TO ROBERTHARRISON REID, OF SAME PLACE.

COMBINED CASH INDICATOR, REGISTER, AND CALCULATOR.

SPECIFICATION formingpart of Letters Patent No. 429,486, dated June 3,1890.

Application filed September 9, 1889. Serial No. 323,42 (No model.)

To all whom it may concern.-

Be it known that I, JOHN SHARPE, of Toronto, Province of Ontario, andcounty of York, Canada, have invented a new and useful Improvement. inComputing-lvlachines; andI do hereby declare that the following is afull, clear, and exact description of the invention, which will enableothers skilled in the art to which it appertains to make and use it,reference being had to the accompanying drawings, forming a partthereof.

My invention relates to an improvement in computing-machines adapted tobe used for purposes of addition, subtraction, multiplication, anddivision; and it consists in the peculiar construction and combinationof devices that will bemore fully set forth hereinafter, andparticularly pointed out in the claims.

In the accompanying drawings, Figure 1 is a front elevation of myimproved computer. Fig. 2 is a similar view of the same, the front sideof the inclosing-ease being removed. Fig. 3 is a top plan view partly inhorizontal section. Fig. 4 is a detailed perspective view'of thetrip-bar. Fig. 5 is an end view of the computing machine. Fig. 6 is avertical transverse sectional view of the same. Fig. 7 is a detailedelevation of the gears and the tens-operating keys. Fig. 8 is a detailedperspective view of the guide-bar, the ratchettumblers, and the dog.Fig. 9 is a similar view of one of the rocking-detents. Fig. 10 is apartial rear elevation of the computingmachine, the rear side of thecase being removed. Fig. 11 is a detailed elevation of the gears and thekeys forming part of the hundredsregistering i'nechanisi'n. Figs. 12,13, and 1a are detailed elevations of the ratchetsleeves. Fig. 15 is adetailed perspective view of the tens-rocking detent. Fig. 16 is adetailed perspective view of one of the weight-arms.

The main shaft G of the registering-machine extends through bear-in gsin the ends of the case and is adapted to move endwise therein. A coiledextensile spring a bears against one end of the case and against ashoulder b on the shaft and serves to hold the latter normally in theposition shown. In

' 9 indicate hundreds of millions.

the opposite end of the main shaft is pivoted a lever 0, having aneccentric-cam d, which, when the lever is moving outward, is adapted tobear against the end of the case and draw the main shaft endwise, forthe purpose to be presently described.

Arranged on the main shaft and loosely and independently revolublethereon are a series of disks 1 2 3 at 5 6 7 8 9, each of which isprovided on its periphery with a series of numerals from O to 9,arranged at suitable regular distances apart. The numerals on the disk 1indicate units, those on disk 2 indicate tens, those on disk 3 indicatehundreds, those on disk 4 indicate thousands, those on disk 5 indicatetens of thousands, those on disk 6 indicate hundreds of thousands, thoseon disk 7 indicate millions, those on disk 8 indicate tens of millions,and those on disk The number of disks may be increased at will to adaptthe machine to register sums of any desired magnitude. The said disksare provided with spur-wheels 1"" 2 3 l 5 6" 7 S 9, respectively, thesaid spur-wheels being rigidly secured to or formed integrally withtheir respective disks, and the said wheels being all of the samediameter and provided with the same number of teeth.

Openings P are made in the front side of the inclosing-case, throughwhich the numbers on the disks are presented successively as the disksare rotated. A sleeve 1 extends from one side of the wheel 1 and issecured firmly thereto. Said sleeve is loose on the main shaft, and hasat its outer end a spurwheel 1, which is exactly similar to the wheel 1.A shaft T is arranged parallel with the shaft G and at a suitabledistance therefrom, and has its ends rigidly secured in the end of thecase. On this shaft T? are loosely mounted a series of spur-wheels efghi 7t Zm 91-, which are all of the same diameter and have the samenumber of teeth. The wheel c meshes with the wheel 1 The wheel f mesheswith the wheel 2. The wheel g meshes with the wheel 3. The wheel hmeshes with the wheel l. The wheel i meshes with the wheel 5. The wheelmeshes with the wheel (5. The wheel Z meshes with the wheel 7. I00

The wheel at meshes with the wheel 8. The wheel a meshes with the wheel9. The wheels 9 h i 7 Z m n are provided on one side with a series oftappet-pins 0 corresponding in numher to the numerals on the disks-thatis to say, there are ten of the said pins on each of the said wheels.Each spur-wheel 3 4. 5 6 7 a 8 9 is provided with a radial tappet-pin1), (see Figs. 2 and 3,) which pins are in the paths of the pins 0, andare arranged between the numerals O and 1 on their respective disks.Pawls D engage the wheels 71 t 7.. I'm at and serve to prevent the samefrom turning in a reverse direction from that indicated by the arrow Ein Fig. 6.

Ashaft T2 is arranged lengthwise in the case and at a suitable distancein rear of and below the shaft T. On this shaft T is loosely mounted asleeve G which has ten ratchets, the width of which is equal to thelength of the sleeve. Rigidly secured to the said sleeve is a spur-wheel11 which engages the loose spur-wheel f on the shaft T. Thelatter wheelengages the wheel 2. Hence when rotating motion is imparted to the saidsleeve the disk 2 will be turned.

Arranged at a suitable distance above the shaft F and parallel therewithis a shaft K on which are loosely mounted a pair of ratchetsleeves L Mwhich are similar to the ratchetsleeve G The ratchet-sleeve L has aspurwheel N that meshes with the idle-wheel e on the shaft T, whichidle-wheel engages the wheel 1. The ratchet-sleeve M has a spurwheel 0,that meshes with the idle-wheel g, also on shaft T which idle-wheelmeshes with the wheel 3.

Loosely mounted on the shaft T is a rockingdetent T Fig. 0, which has ahorizontal engaging-lip U of suitable length, and from one end of whichdetent T projects an arm Y A spring is attached to the shaft at a pointabout midway between the ends of the rocking-detent, and the free end ofthe spring bears against the rear side of the lip, and hence moves thesame normally in one direction. A pivoted dog X is normally held inengagement with the arm V by a spring Y and at the inner end of the dogis an arm Z which is in the path of the tappet-pin A that projects fromthe ratchet-sleeve IF at one end thereof. A spring-pressed pawl Bengages the said ratchet-sleeve to prevent the same from rotating in areverse direction.

On a suitable shaft 0 Fig. 7, is loosely mounted a roeking-detent Dwhich has a horizontal engaginglip E of suitable length, and from oneend of the said detent depends an inclined arm F. A spring G is attachedto the shaft C and its free end bears against the rear side of the lip Eand moves the detent normally in one direction. A springpressed dog llnormally engages and holds the arm F and the arm I of the dog is in thepath of a tappet-pin K, that projects from the wheel 11 at one end ofthe ratchet-sleeve G A spring-pressed pawl L engages thev ratchet-sleeveand holds the same against reverse rotation, Fig. 6.

A substantially semi-cylindrical ratchettumbler sleeve 3 3 is looselyjournaled on a shaft N and has a series-say eightof ratchet-teeth 0which extend its entire length and are concentric with the shaft. Thatside of the tumbler which is provided with ratchetteeth is necessarilyheavier than the other or cutaway side thereof, and therefore theratchet-tumbler is normally in the position shown. On the center of thecut away portion of the ratchet-tumbler is a semicircular web or flange1"", which is provided with ratchet-teeth R. Arranged on the same shaftwith the tumbler M, end to end, are a pair of similar ratchet-sleevetumblers S T, Fig. 8. Gravity-pawls U engage the flange or webratchet-teeth R of the respective tumblers. The function of the saidtumblers will appear hereinafter.

()n a suitable shaft V are pivoted three banks of finger-keys 1 2 3,there being nine keys in each bank, and the said keys of each bank beingnumbered consecutively from 1 to 9. Hubs or sleeves \V are formed on thearms of the keys, which bear against each other end to end and serve tospace the said keys to the necessary distance apart. Theinward-extending arms X of the fingerkeys pass under the rod L, whichserves to connect the weight-arms, the said arms X extending to within ashort distance of the ba ck of the case. Each finger-key is indcpendentof all the others and forms a lever of the first class.

Three series of vertically-movable ratchetbars 1 2 3" are maintained inposition by guidebars Y or other suitable devices. There are as many ofthe ratchet-bars as there are finger-keys, and each ratchet-bar ispivoted at its lower end to the rear end of the arm X of its respectivefinger-key by means of a pin L which operates in a slightly-elongatedslot A", made transversely in the ratchetbar. The ratchet-bars arearranged and maintaiued at a slight distance in front of theratchet-tumbler sleeves, and each ratchet-bar has on its rear side aseries of ratehet teeth B", which correspond in number to and areadapted to engage the teeth 0 of the ratchettumblers when theratchet-bars are moved upward. The said ratchet-tumblers thus serve tokeep the teeth F of the ratchet-bars in engagement with theirratchet-sleeves while the ratchet-bars are moving upward, and when theratchet-bars reach the upper limit of their stroke their teeth 13 will,meshing with the teeth 0 of the ratchet-tumblers, have turned the latterabout half a revolution, so that the heavier sides are uppermost, andthe impulse of the ratchet-bars cause the ratchet-tumblers to completetheir revolution. It willbe understood that while the teeth O are out ofengagement with the teeth 3" the ratchetbars will be free to descend bytheir own gravity and the assistance of pivoted weight- ITO arms X,which are connected by a rod L, bearing 011 the finger-key levers, theteeth of the ratchet-bars slipping idly on the ratchetsleeves, thusrestoring the bars, tumblersleeves, and finger keys to their initialposition..

The upper guide-bar Y has on its front side a series of notches G whichreceive the rear sides of the ratchet-bars and maintain the latter atthe required distance apart, and the inner sides of the said notches areinclined, as shown at D. On the rear side of each ratchet-bar, near theupper end thereof, is an inclined offset cam E, which is adapted toengage the inclined side D of its respective guide-notch when theratchet-bar reaches the lower limit of its movement, and thereby movethe upper end of the ratchet-bar forward and move its ratchet-teeth Fforward laterally i ate the path of its respective ratchetsleeve. Theratchet-teeth F of the ratchetbars of each bank of finger-keys vary innumber from one to nine, respectively, and correspond to the value ofthe numerals on the said keys-that is to say, if the finger-key benumbered 9, the ratchet-teeth F of the ratchet-bar attached to saidfinger-key will be ninein number,and so on. The ratchet-teeth F ofthebars of eaehbankof keys areadapted and designed to engage differentratchet-sleeves. In other words, the teeth on the ratchet-bars 1",attached to the bank of keys 1 are arranged to engage and rotate thesleeve L the teeth 011 the ratchet-bars 2 attached to the banks of keys2, are arranged to engage and rotate the sleeve G and the teeth on theratchet-bars 3 attached to the bank of keys 3, are arranged to engageand rotate the sleeve M hence the said ratchet-teeth are differentlylocated on the different sets of ratchet-bars.

At the lower end of each set of ratchetteethF is a shoulder or stop Gwhich, by engaging its respective revoluble ratchetsleeve when theratchet-bar reaches the upper limit of its stroke, will absolutelyprevent further rotation of the said sleeve, and hence prevent thenumbered disk geared to and operated by the said sleeve from moving toofar and registering the wrong number.

At the upper end of each ratchet-bar 1 is a forward-extending arm 1 andpivoted to the front end thereof is a depending link-arm 1. Each of saidlink-arms hasan offset shoul- (.ler H on its front side near its lowerend, adapted to be engaged by thelip of the rocking-detcnt T and on therear side of each of said link arms, at a suitable distance from thelower end thereof, is a shoulder I", which is adapted to' engage a toothon the sleeve G as will be hereinafter more fully described. A spring K,(see Fig. 6,) attached to each arm 1*, has its lower end bearing againstthe rear side of one of the link-arms, the function of the said springsbeing to normally hold the link-arms forward in position to cause theirshoulders I to be thrown out of engagement with the ratchet-sleeve G Atthe upper end of' each ratchet-bar 2 is a forward-extending arm 2'==',and pivoted to the front end thereof is a depending link-arm 2. Each ofsaid linlearms has an offset shoulder L on its front side, adapted to beengaged by the lip of the rocking-detent D and on the rear side of eachof said link-arms 2 at a suitable distance from the lower end thereof,is a shoulderM, which is adapted to engage with the ratchet-sleeve M Theratchet-bars 8 attached to the last bank of keys, are not provided withlinkarms, such as hereinbefore described.

In the front side of the upper portion of the case is a longitudinalopening a, which is covered with a sheet of transparent glass. Arrangedfrom end to end of .the case, one above the other, and at suitabledistance 'in rear of and below the opening 7, are a pair of horizontalguide-bars R. In openings in the said guide-bars are arranged three setsof vertical tumbler-rods l 2 3, which are equal in number to theratchet-bars and are arranged in the same vertical planes with the armsN of the ratchet-bars. A series of tablets 1 are attached to the upperends of the rods 1, and similar series of tablets or indieaters 2 3' areattached to the upper ends of the rods 2 3, respectively. Said tabletsare normally below the level of the opening 0', out of sight. Thetablets Ware numbered from 1 to 9 and indicate tens, and the tablets 3'are numbered from 1 to 9 and indicate hundreds. Each tablet correspondsin value to its respective finger-key.

From the foregoing itwill be understood that the highest value or numberthat may be indicated by the tablets 1 2 3 when the tablet of highestvalue of each series is presented behind the opening is 999, the nineappearing thus: 9 hundreds, 9 tens, 9 units.

Then a fin ger-key is operated, its respective ratchet-bar, as thelatter rises, strikes the lower end of its respective tumbler-rod, andthereby causes the appropriate tablet corresponding to the value of thesum to be noted to appear before the openings in the case. Springs S arecoiled on those portions of the tumbler-rods between their guide-bars Rand the lower ends of said springs bear on collars T on saidtumbler-rods, and thereby normally force the latter down, and hence movethe tablets below the opening in the case.

A trip-bar Y is arranged lengthwise in the case and has vertical arms Yat its ends, which are pivoted to the ends of the case and adapt thetrip-bar to oscillate. Studs A limit the forward movement of thetrip-bar, and springs 13, which bear against the rear side of the armsY, keep the latter normally in engagement with the studs.

IVhen a finger-key is operated,the force of its ratchet-bar issuflicient to strike the lower end of the tumbler-rod with such force asto drive the collar on the tumbler-rod upward, entirely across thecam-face of the trip-bar. As soon as the collar passes up beyond thetrip-bar the springs of the latter force it back under the collar,thereby retaining the latter and its tumbler-rod at the upper limit oftheir stroke, and consequently the tumblerrod will be maintained in suchposition as to display its tablet before the opening untilanotherfinger-key is operated. lYhen this is done, the instant the nextascending tumblerrod collar engages the trip-bar and the latter is movedrearward, the collar on the tumblerrod which has since thelast key wasoperated been supported in an elevated position will be released, whenits spring will instantly force it down to its normalposition andwithdraw its tablet from display.

The mechanism hereinbefore described is adapted for computing sums inaddition, and the operation thereof for this purpose is as follows:Before the initial operation of the machine all of the disks 1 2 3 l: 5G 7 8 9 must be turned with their 0 or zero marks opposite the openingP, and this must be effected by the means hereinafter described. We willassume that the first sum to be noted is of the value of five units. Theoperatortouches the key 5 of the bank 1, and by so doing causes theratchet-bar attached to said fingerkey and having five ratchet-teeth Fto ascend, said teeth engaging the ratchet-sleeve L and turning the same011 its shaft through a space equal to the width of five ratchetteeth orfive -tenths of its circumference. This sleeve, being geared to the disk1 by the wheels N e 1, sleeve 1 and wheel 1, causes the said disk toalso rotate through the same proportion of its circumference, andthereby presents the number 5, indicating units, to the appropriateopening P. At the same instant the said ratchet-bar operates thetumbler-rod having the tablets 5 in series 1 to be moved to display fiveunits. The same initial impulse of the finger-key which operated theratchet-bar and registering mechanism will also cause the bar L to riseand lift the weight-arms X. \Vhen the operator removes his finger fromthe key, the weight-arms, by causing the rod L to depress the inner endof the finger-key, return the latter to its normal position and causethe ratchet-bar to descend with it. \Vhen another key of the value, say,of four units has been operated, the sleeve L will have been turnedthrough nine-tenths of its revolution, and will have brought itstappet-pin A to a position adjacent to the upper side of the arm Z ofthe dog X and the disk 1 will have been turned to bring the number 9 orthe sum of five plus four before the appropriate opening P.

'0 will assume that the key of the value of one unit is now operated,which will cause the appropriate ratchet-bar of the series 1*" andhaving only one ratchet-tooth F to engage the ratchet-sleeve L on itsascent and turn the same through a distance equal to one space or thewidth of one tooth, and thereby complete the rotation of the saidsleeve. As the latter effects this complete rotation, the tappet-pin Abeingin engagement with the arm Z of dog X as before stated, willdepress said arm and cause the dog to release the arm Y of therocking-detent T, when the spring V will instantly move the said detentrearward. 011 the succeeding descent of the ratchet-bar the said detentwill engage the link-arm 1, attached to said ratchet-bar, and saidlink-arm will be moved rearward thereby against the resistance of thespring K", and the shoulder I" of said link-arm will engage one of theteeth of the ratchet-sleeve G geared to the tens-disk 2 by the mechanismhereinbefore described, and as the ratchet-bar and link-arm completetheir descent the shoulder l' of the link-arm will rotate the sleeve Gthrough a space equal to one-tenth of its circumference, and hence causethe tens-disk 2 to turn through one-tenth of a revolution, from 0 to 1,and present the latter number to the appropriate opening P.

The shape of the shoulder I is such that as soon as it has moved thesleeve one space the next succeeding ratchet-tooth of the said sleevewill engage the rear side of the link-arm and push the shoulder 1'thereof out of engagement with the said sleeve G'-,

and hence the latter will be only moved the required distance, and asthe link-arm continues to descend after thus disengaged from the sleeveG its offset shoulder or cam H" will continue to engage the detent T andin moving down across the lip thereof will return the said detent to itsinitial position and cause its arm V to be engaged again by the dog Xwhich will retain the rocking-detent T in its initial, position untilthe sleeve L has been moved through another complete revolution.

From the foregoing it will be understood that as often as the sum of thevalues registered by the bank of units-key 1 exceeds ten the sleeve Lwill be automatically operated to cause the tens-disk 2 to be moved onespace and present its next highest number to the appropriate opening P.

\Vhen a key in the tens-bank is operated say the key of the value ofthree tens, or thirtyits ratchet-bar :2 is caused to operate the sleeveG through a space equal to threetenths of its circumference, andconsequently the tens-disk 2 will be moved a corresponding distance bythe gear-wheels which connect it to the sleeve G \Ve have assumed thatthe said disk 2 has been already moved one space by the previousoperations of the link-arms of the ratchet-bars attached to theunit-keys of bank 1. Consequently the three spaces through which thesaid disk 2 is now turned by the aforesaid appropriate key andratchetbar of the bank 2 will cause the number indicating four tens, orforty, or the sum of three tens plus one ten, to appear on said disk 2through its appropriate opening P.

It is understood from the description hereinbefore given of the tabletsor indicators that the appropriate one of the latter will be displayedwhenever a finger-key of any bank is operated. The highest number thatmay be registered by the disks 1 2 is ninety-nine, when the figures nineof said disks are displayed. Each time that the sleeve G is caused tomake a complete revolution, either by the ratchet-bars attached to thekeys 2 or by the link-arms of the ratchet-bars attached to the keys1that is to say, either by registering tens or the sums in tens of unitsits tappet-pin K will engage the arm 1 01? the dog 11 and cause thelatter to disengage its arm F of the rocking-detent E and consequentlyon the succeeding descent of one of the ratchet-bars 2 the said detentwill engage the offset shoulder M on the 1ink-arm 2, attached to saidratchet-bar, and said link-arm will be moved rearward thereby againstthe resistance of its spring, and the shoulder M of said link-arm willengage one of the teeth of the ratchet-sleeve M geared to thehundreds-disk 3 by the mechanism hereinbefore described, and move saidsleeve M one space, and thereby operate the disk 3 one space and causeits next highest number to appearbefore the appropriate opening P.

\Vhen one of the finger-keys in the bank 3 is operated, the ratchet-barattached to said key is caused to partly rotate the disk 3 the requirednumber of spaces to indicate the sum in hundreds plus the sum in unitsand tens previously indicated.

When the sum of all the operations is more than nine hundred andninety-nine, the disk 3, indicating hundreds, will be turned by themechanism hereinbefore described to such position as to cause its pin pto engage one of the pins 0 of the wheel h and move the latter onespace, and hence cause the said Wheel, which meshes with the Wheel at,to move the latter and its disk 4 one space, and thereby cause thefigure 1 on said disk, indicating thousands, to appear before theappropriate opening P, and so on until the said disk 4 has been causedto make a complete revolution,when the pin 19 on said disk 4 will engageone of the pins 0 on wheel 1' and cause the latter to move the disk 5one space, and thereby indicate ten thousand plus and ninety-ninemillion nine hundred and ninety nine thousand nine hundred andninety-nine; but by increasing the number of disks and the operatingwheels and pins the machine may be adapted to indicate sums up to anyamount.

From the foregoing description it w1ll be clear that three sums,exclusively in units, tens, and hundreds, may be registeredsimultaneously by depressing the appropriate finger-key of each bank.

A machine constructed with three banks of keys such as shown is capableof registering at a single operation any sum less than one thousand; butbyincreasing the numbers of banks, ratchets, sleeves, ratchet-bars,link-arms. and rocking-detents the machine may be rendered capable ofregistering at a single operation a sum of any desired amount.

In order to prevent more than one key of each bank from being operatedat the same instant, I provide a rectangular open frame E, which isarranged in the rear side of the case. Vertical bars divide the saidframe into as many divisions as there are keys. The rear ends of thefinger-key arms extend through the said divisions, and at the end or thelatter are stops or studs H. A series ot eight rolling disks 15 arearranged in seats or ways 15 in each division of the same, and above thespaces between the pairs of said arms. The combined width of all thedisks in a single division plus the width of one of the key-arms X isequal to the space between one pair of the stops or studs H". Hence whenthe rear end of one of the finger-key arms X is moved upward when thekey is operated said arm rolls the disks laterally, and the latter openonly a sufficient d stance to clear the said arm before they come incontact with the stops or studs 11", and consequently render itimpossible to operate another key of the same bank.

Arranged across the case, near the rear side thereof, is a lock-plate L,which has its ends provided with pivots M that bearin the ends of thecase. The said lock-plate is at a slight distance in rear of the frameE, and has the dependingfiange N and the inclined offset 0 the latterextending toward the frame E and the said flange N of the lock-plate hasits lower edge in a plane slightly higher than the upper sides of thelinger-key arms when the latter are at rest. The flange N is below thepivots hi and the offset 0 is above the same. A spring P bears againstthe rear side of the lock-plate at a point near its center, and normallyretains the lock-plate 1n the position shown,with its flange N inclinedrearward a suifioient distance to clear the rear ends of the finger-keyarms. The operation of this portion of the machine is as follows: Vhen afinger-key of one or more banks is depressed, the inner ends of the armsthereof rise, and by engaging the inclined offset 0 partly turn thelock-plate on its pivot and cause the flange N to move forward over thearms of the remaining keys, and hence lock them and prevent them frombeing operated until after the pressure on the finger-keys in use hasbeen remoy'ed and the said keys have returned to their initial position,when the spring 1 restores the lockplate to the position it formerlyoccupied.

I will now describe my improved mechanism whereby the computer isadapted to be used for the purposes of subtraction, multiplication, anddivision.

A shaft B, which is exactly similar to the shaft G, is arranged parallelwith the latter and at a suitable distance in front of and below thesame, and has its ends journaled in bearings in the ends of the ease andadapted to move endwise therein. A coiled extensile spring 0 is arrangednear one end of the shaft B and bears between a shoulder D thereon andone end of the case, and to the projecting end of the shaft is pivoted acam-lever E, which is adapted to be used for moving the shaft endwise,this cam-lever being in all respects similar to the cam-lever 011 theshaft G, previously described. Loosely journaled on the shaft 13 are aseries of disks 1' 2 3 t 5' 6 7 8 9, which are of the same size andconstruction as the adding-disks on the shaft G, their numbers being inthe same order as those on the adding-disks, and have spurwheels 1" 2 3i 5" 6" 7 8" 0 respectively, which are adapted to mesh with therespective wheels on the said disks on the shaft G. A shaft 1* isjournaled in suitable bearings in the case, has a spur-pinion 1 at itsinner end, which engages the wheel 1, and at the outer end of the saidshaftis a circular milled head 1, by which the shaft may be readilyturned by the fingers to cause the disk 1 t0 revolve. A similar shafthas a spur-pinion 2 engaging the wheel 2 and has also the head 2. Asimilar shaft has a spur-pinion 3 engaging the wheel 3 and has also thehead 3. A similar shaft 4* has a spur-pinion 4C engaging the wheel 4",and has also the head 4:. A similar shaft 5 has a spur-pinion 5 engagingthe wheel 5", and also has the head 5. A similar shaft 6 has aspur-pinion 6 engaging the wheel 0 and has also the head 6. A similarshaft 7 has a spur-pinion 7 engaging the wheel 7", and has also thehead'T. A similar shaft 8* has a spur-pinion 8 engaging the wheel 8",and has also the head 8. A similar shaft J has a spurpinion t) engagingthe wheel 9, and has also the head 9. Thus the disks 1 2' 3 t 5 6 7 S 9are adapted to be revolved independently of each other and in eitherdirection. The spur-wheels of said disks are of sufficient width toenable the said disks and spurwheels to be moved laterally by theendwise movement of the shaft 1 without disengaging said spur-wheelsfrom said pinions. The numbers on the disks 1 2 3 4: 5 6 7 S 9 appearsuccessively when said disks are rotated before a series of openings Rin the front side of the case, below the openings P.

I will now describe the operation of myinvention to perform examples insubtraction. \Ve will assume that it is desired to subtract the sum of27,777 from 45,835. To accomplish this the shaft G must be first movedendwise by its cam-lever in the manner hereinbefore described, so as todisengage the spur-wheels of the addingdisks from the spur-wheels on theshaft T, and thereby render them capable of rotation in eitherdirection. The cam-lever, when turned outward from the end of the ease,maintains the shaft in this position, as will be readilyunderstood. Theshaft l3 must also be moved simultaneously with the shaft G to keep itsdisks in gear with the adding-disks. Then by turning the appropriatedisks .1 2 3 4t 5 by means of their respective shafts and pinions thedisks 1 2 3 4: 5 must be turned to cause the number of 45,935 to appearbefore the openings P. The disks of higher value than those involved inthe example should not be operated. Ilavin g thus brought the number45,835 before the openings 1, the operator causes the shaft B to moveendwise, so as to disengage its disks from the adding-disks, and he thenturns the said disks on shaft 1 to the 0 or zero-mark and moves theshaft B, so as to re-engage its disks with its addingdisks. Tofacilitate the description of the operation of the maehine,Iwilldesignate the disks on shaft- G as the adding or primary disks and thoseon the shaft- 13 as the secondary disks. llaving arranged the disksinvolved in the computation in the manner j ust described, the operatorturns the secondary disks in progressive order of their numerals untilthe lesser sum, 27,777, involved in the computation appears on therecordingdisks before the openings R. By thus turning the secondarydisks the primary disks geared thereto will be moved in reverse orderand cause numerals of decreasing value to appear before the openings P,and when the lesser sum, 27,777, shall have been indicated by thesecondary disks, as before stated, the remainder, 18,058, will appearbefore the openings P.

\Vhen multiplying, the multiplicand must be first caused to appear onthe primary disks before the openings I the secondary disks being thenat O or zero, as before, and then, beginning with the secondary disks oflowestvalue, said secondary disks will be turned in reverse order untilthey display the multiplier before the openings R. 13y thus revolvingthe secondary disks in reverse order the primary disks will be turned inprogressive order, and the instant the multiplier appears before theopening R the product will be indicated by theprimary disks before theopening P.

It will be understood that the primary disks must be in gear with thecarrying-wheels f 9 7L 1'. 7; 7 m a while being operated for thepurposes of multiplication, in order that units of a lower denominationwill be carried to IIO those of a higher denomination, and that inasmuchas the said primary disks are turned in progressive order whenmultiplying it is necessary to have the pawls I) out of engagement withthe carrying-wheels which work with the spunwheels of said disks. Toaccomplish this, I have devised a trip-shaft E arranged under the saidpawls and having an offset, crank, or arms F adapted to engage the lowersides of the pawls when the trip-shaft is turned, and thereby disengagethe paWls from the carrying-wheels, as will be readily understood. Thetrip-shaft has one end projecting beyond one end of the case andprovided with a head G: or an arm whereby it may be turned.

In using the machine for the purposes of division the primary disks mustbe set to cause the dividend to appear before the opening P, While thesecondary disks are at zero or 0, and the latter are then turned inprogressive order, beginning With the disks of highest value, until thedivisor appears before the openings B. This movement of the secondarydisks causes the primary disks to be rotated in reverse order, and whenthe divisor is indicated, as before stated, the primary disks will havebeen turned to such position as to cause the quotient to appear beforethe openings P, as will be apparent.

It will be seen that the secondary computing-disks on the shaft B andtheir shifting and rotating devices constitute a secondary mechanismwhich practically converts a cashindicator into a calculating-machinecapable of performing all the ordinary functions of arithmetic.

. It will be apparent that modifications may be made in the shifting androtating devices for the secondary computing-disks, and I do nottherefore desire to limit myself in this particular.

Having thus described my invention, I claim- 1. In a computingmachine,the primary disks, the carrying devices connecting the same, for thepurpose set forth, and the secondary computing-disks geared to theprimary disks, said primary and secondary disks being numbered in thesame order, all in combination, substantially as described.

2. In a coi'nputing-machine, the combination of the adding or primarydisks, the carrying-wheels geared thereto, the secondary computing-disksnumbered in the same order as the primary disks, and means,substantially as set forth, to shift said secondary and primary disksinto and out of gear with each other, substantially as described.

In a computing machine, the primary registering-disks having carryingdevices, in combination with the secondary computingdisks numbered inthe same order, means, substantially as specified, to move said primaryand secondary disks into and out of gear with each other, and devices toindependently revolve the secondary disks.

4-. In a computing-maehine, the combina-' tion of the laterally-movableprimary disks, the finger-keys and connecting devices to operate thesame, the relatively-fixed carrying- Wheels adapted to gear to theprimary disks, the detents to prevent retrograde rotation of thecarrying-wheels, the secondary computing-disks adapted to be shiftedinto and out of gear with the primary disks, and the trip device torelease the detent from the carrying-wheels, substantially as described.

5. In a computing-machine, the combination of the laterally-movableprimary disks, the finger-keys and connecting devices to operate thesame, the relatively-fixed carryingwheels adapted to gear to theprimarydisks, the detents to prevent retrograde rotation of thecarrying-wheels, the secondary computing-disks adapted to be shiftedinto and out of gear with the primary disks, the trip device to releasethe detents from the carryingwheels, and the devices to independentlyrotate the disks. r

6. The combination of the eudwise-movable shafts, the primary andsecondary registering-(lisks thereon and capable each of independentrotation, the finger-keys and connecting devices to operate the primarydisks, the relatively-fixed carrying-wheels adapted to gear to theprimary disks, the detents to engage said carrying-wheels, for thepurpose set forth, and the trip device to release said detents,substantially as described.

'7. In a computing-machine, the combination of the endwise-movableshafts, the in dependently-revoluble primary and secondary registering-disks thereon and adapted to gear the levers to move the shafts, andthereby throw said primary and secondary disks into or out of gear witheach other, the independentlyrevoluble shafts geared to the secondarydisks, the relatively fixed carrying- Wheels adapted to gear to theprimary disks, the finger-keys and mechanism to operate the primarydisks, the detents or pawls to engage the carrying-wheels, for thepurpose set forth, and the trip devices to disengage the pawls ordetents from the carrying-wheels, substantially as described.

8. In a computing-machine, the combination of the primary disks, thesecondary computing-disks, means to shift said primary and secondarydisks into and out of gear with each other, and the independent shaftshaving the pinions engaging the secondary disks, whereby the latter maybe independently rotated, substantially as described.

9. In a computing-machine, the combination of the ratchet-sleeves gearedto the primary indicating-disks, the ratchet-bars to engage the sleeveswhen moving in one direction, and the Weighted ratchet-tumbler sleevesengaging the ratchet-bars and cut away on one side, and secondarymechanism, for the purpose set forth, substantially as described.

10. In a compnting-machine, the combination of the ratchet-sleeves andgears to operate the primary disks, the ratchet-bars attached to thefinger-keys and operating the ratchet-sleeves in one direction, and theratchet-tnmbler sleeves to maintain the ratchetbars in gear with therz'Ltehet-sleeves when moving in one direction and release themtherefrom when moving in the reverse direction, and secondary mechanism,substantially as described.

11. In a eompnting-maehine, the combination of the ratchet-sleeves andgears, the primary disks, the ratchet-bars connected to the finger-keysand operating the ratchetsleevesin one direction, the revolubleratchettnmbler sleeves engaging said ratchet-bars to maintain the latterin engagement with the ratchet-sleeves when moving in one direction andhaving the eccentric or cut-away faces to release said bars from saidsleeves, and secondary mechanism, substantially as described.

JOHN SIIARPE.

Witnesses:

MARY BISHOP, S. A. TERRY.

